The pain on both sides of the knee may be related to trauma, or it may be caused by over-activity of the knee joint or gouty arthritis. 1. Trauma: If both knees are subjected to external force at the same time, and this force is relatively large, it may lead to local soft tissue damage, such as the joint capsule or meniscus damage, etc., so that both knees will also have pain, and the pain is usually more obvious. 2. Knee overactivity: If the knee joint has been overactivated recently, it may lead to cumulative damage to the articular cartilage, which may also trigger the phenomenon. 3. Gouty arthritis: patients suffering from this disease, in the acute stage of the disease on both sides of the knee is likely to have pain, but also may be accompanied by local redness, swelling and heat and other discomfort. In addition, the cause of this phenomenon may also be suffering from rheumatoid, patellar chondromalacia and meniscus damage, etc., the specific cause of the disease is recommended to consult a doctor for diagnosis and treatment.